Answer:
answers is to increase DNA mutations
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Two important factors is temperature and liquid water.
First one, disease causing microorganisms
Homozygous.
You can tell in future that if both letters are either lowercase or upper case (e.g. TT or tt) the answer is always HOMOzygous. If the letters are different cases (e.g. Tt or tT) the answer is always HETROzygous. This is because 'homo' means 'same' and 'hetero' means 'different'.